Machine for automatically grinding knife-blades.



PATBNTBD MAY 12, 1903.

A. GONON. I MACHINE FOB. AUTOMATICALLY GRINDING KNIFE BLADES.

APPLICATION FILED MAY 27. L902.

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No. 727,614. PATENTED MAY 12, 1903.

A. GONON. v MACHINE 0R AUTOMATICALLY GRINDING KNIFE BLADES,

APPLICATION IIELED MAY 27. 1902.

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PATENT OFFICE.

MACHINE FOR. AUTOMATICALLY GRINDING KNIFE-BLADES.

SEECIFICATION forming part of Letters Patent No. 727,614, dated May 12, 1908. Application filed May 27,1902. Serial No. 109,200. (No model.)

To all whom it may concern:

Be it known that I, ANTOINE GoNoN, a citi-f ically Grinding Knife-Blades, of which the following is a specification.

This invention relates to improvements in machines for automatically grinding knife- .blades with a horizontal grindstone, charac terized by the fact that a suitable mechanism moves the blade in the direction of the radius of the grindstone in proportion as the work proceeds, at the same time assuring the greater or less grinding of the blade at its different parts, with a view of obtaining the desired shape.

The said machine essentially comprises a grindstone fixed on a plate revolving at a great speed and a slide carrying the blade, an oscillating part of which against whichthe blade is fixed or arranged serving to automatically press the said blade against the grindstone until said pressure is stopped by an adjustable abutment. The slide is displaced at the moment desired by suitable gear in such a manner as to engage the blade radially, while the adjustable abutment is displaced on a guide of determined outline, which allows of varying the thickness of the blade in its longitudinal direction and obtaining for said blade the form required.

In the accompanying drawings, Figure 1 is a sectional elevation of myimproved machine. Fig. 2 is a plan view of same, the grindstone being removed. Fig. 3 shows, on a larger scale, a detailed elevation of the slide carrying the blade and of its support. Fig. 4 is a plan View of same, and Fig. 5 is a sectional view of same.

The machine comprises a hollow standard 1, provided at one side with a slot for the passage of the belt and carrying in bearings 2 and 3 a vertical shaft 4, adapted to receive a horizontal plate 5, in which the grindstone 6 is rigidly fixed. The standard 1 also carries, according to its dimensions, one or more cast blocks 7, on each of which is fixed an adjustable support 8 and at the upper part of which is bolted a horizontal frame 9, on which moves a slide 10. The latter is adapted to be oscillated or moved on its support 9 by means of a slotted nut 11, moved by a lever 12, which engages on the said lever being moved forward a screw 13, arranged in the frame 9 and having a continuous rotary motion, which it receives by means of a pulley 21 from a driving-belt or the like arranged above the machine.

, The slide 10 carries at its lower part a block 14, secured to a pivot'17, whichconstantly tends to move downward under the action of a lever 15, mounted on the same pivot 17and carrying a counterweight 16. To the said block His fixed a clamp 18, the extreme part of which carries an adjusting screw or abutment 19, which slides during the displacement of the slide on a guide 20, fixed to the frame 9, andthe shape of which corresponds to that which it is desired to give the blade.

The operation of the machine is as follows: The grindstone being put into motion, as well as the screw 13, the lever 15 is slightly raised and the rough blade is placed under the pivoted block 14, the inclined lower surface of which forms a wedge in such a manner that the said blade bears against small bosses or blocks arranged on the said lower surface of the block and is caused to remain in that position by reason of the pressure it receives from the grindstone. The lever 15 is then released, so that by the action of the weight 16 the block 14 bears on the blade, which is ground by the stone until its thickness has been reduced,and the adj listing-screw 19 is brought into contact with the guide 20. From this moment the grindstone slides-under the blade, but grinds it no longer for want of pressure. I may mention that the knifeblade is arranged in the direction of the radius of the grindstone and that its length is much greater than the breadth of the operating part of the said grindstone. The fang or heel of the said blade has originally been so placed that it coincides with the exterior edge of the grindstonein such a manner that in the first part of the working described only a part of the blade measured from the fang or heel and having a length equal to the breadth of the grindstone is made thinner. If at this moment the lever 12, to which is fixed the nut 11, is pushed completely down, it eugages the rotary screw 13 and the slide 10 is put IOC into motion, at the same time bringing the blade outward in such amanneras to successivelybringitsdifferent parts under the action of the grindstone. During this movement the end of the adjusting-screw 19 slides on the fixed guide 20, by which the descent of the block, and consequently also the thickness of the bladein the diiferent parts of its length, is regulated. It is known that the blade becomes thinner in proportion as the end is approached. 'lhe ascent of the guide 20 allows of obtaining this result, and, besides, if said ascent is a curve it will allow of giving the edge of the blade the desired section, since it will in that case determine for the two surfaces of the blade two curved surfaces instead of two planes, the line of intersection of which constituting, the edge will be a curved line instead of a straight one. When the blade arrives at the end of its travel, it falls down, and it has then only to be replaced on the slide of a second machine for working the second surface.

I The same machine, according to the dimensions of the blades and its size, may carry one or more slides. In the accompanying drawings I have illustrated a machine arranged for three slides, but only one of them is in place.

Having now particularly described the nature of my said invention and in what mannor the same is to be performed, I declare that what I claim is 1. A machine for automatically grinding knife-blades comprising a fast-rotating horizontal grindstone 6 in combination with a slide 10 moving according to one of the radius of the grindstone, a blade-holder 14 pivoted to the slide and pressing the blade on the grindstone, a clamp 18 secured to the bladeholder 14, an adjustable abutment 19 arranged at the extreme part of the clamp 18 and a guide 20 having a determined outline on which moves the adjustable abutment, substantially as and for the purpose set forth.

2. A machine for automatically grinding knife-blades comprising a fast-rotating horizontal grindstone 6 in combination with a slide 10, a stationary frame 9 arranged parallel to a radius of the grindstone and on which is capable of moving said slide, a rotary screw 13 mounted on said frame, a slotted nut 11 arranged in an opening of the slide, a lever 12 secured to the nut 11 andpivoted to the slide, adapted to bring the nut into engagement with the screw, a block let carrying the blade and pivoted to the slide, a counterweight 16 secured to the block 14, a clamp 18 secured to the block 14, an adjustable abutment 19 arranged at the extreme part of the clamp 18 and a guide 20 having a determined outline secured to the frame 9 and on which moves the adjustable abutment 19, substantially as and for the purpose set forth.

In witness whereof I have hereunto set my hand in presence of two witnesses.

ANTOINE GONON.

Witnesses:

ANTOINE LAVOIX, EDWARD P. MACLEAN. 

